Make sure to not count channels twice

backend/src/tasks/lightning/stats-updater.service.ts

@@ -1,4 +1,3 @@
-import DB from '../../database';
 import logger from '../../logger';
 import lightningApi from '../../api/lightning/lightning-api-factory';
 import LightningStatsImporter from './sync-tasks/stats-importer';

backend/src/tasks/lightning/sync-tasks/funding-tx-fetcher.ts

@@ -1,8 +1,11 @@
-import { existsSync, readFileSync, writeFileSync } from 'fs';
+import { existsSync, promises } from 'fs';
 import bitcoinClient from '../../../api/bitcoin/bitcoin-client';
 import config from '../../../config';
+import DB from '../../../database';
 import logger from '../../../logger';
 
+const fsPromises = promises;
+
 const BLOCKS_CACHE_MAX_SIZE = 100;  
 const CACHE_FILE_NAME = config.MEMPOOL.CACHE_DIR + '/ln-funding-txs-cache.json';
 
@@ -21,7 +24,7 @@ class FundingTxFetcher {
     // Load funding tx disk cache
     if (Object.keys(this.fundingTxCache).length === 0 && existsSync(CACHE_FILE_NAME)) {
       try {
-        this.fundingTxCache = JSON.parse(readFileSync(CACHE_FILE_NAME, 'utf-8'));
+        this.fundingTxCache = JSON.parse(await fsPromises.readFile(CACHE_FILE_NAME, 'utf-8'));
       } catch (e) {
         logger.err(`Unable to parse channels funding txs disk cache. Starting from scratch`);
         this.fundingTxCache = {};
@@ -51,7 +54,7 @@ class FundingTxFetcher {
       elapsedSeconds = Math.round((new Date().getTime() / 1000) - cacheTimer);
       if (elapsedSeconds > 60) {
         logger.debug(`Saving ${Object.keys(this.fundingTxCache).length} funding txs cache into disk`);
-        writeFileSync(CACHE_FILE_NAME, JSON.stringify(this.fundingTxCache));
+        fsPromises.writeFile(CACHE_FILE_NAME, JSON.stringify(this.fundingTxCache));
         cacheTimer = new Date().getTime() / 1000;
       }
     }
@@ -59,7 +62,7 @@ class FundingTxFetcher {
     if (this.channelNewlyProcessed > 0) {
       logger.info(`Indexed ${this.channelNewlyProcessed} additional channels funding tx`);
       logger.debug(`Saving ${Object.keys(this.fundingTxCache).length} funding txs cache into disk`);
-      writeFileSync(CACHE_FILE_NAME, JSON.stringify(this.fundingTxCache));
+      fsPromises.writeFile(CACHE_FILE_NAME, JSON.stringify(this.fundingTxCache));
     }
 
     this.running = false;
@@ -76,13 +79,30 @@ class FundingTxFetcher {
     const outputIdx = parts[2];
 
     let block = this.blocksCache[blockHeight];
+    // Check if we have the block in the `blocks_summaries` table to avoid calling core
+    if (!block) {
+      const [rows] = await DB.query(`
+        SELECT UNIX_TIMESTAMP(blocks.blockTimestamp) AS time, blocks_summaries.transactions AS tx
+        FROM blocks_summaries
+        JOIN blocks ON blocks.hash = blocks_summaries.id
+        WHERE blocks_summaries.height = ${blockHeight}
+      `);
+      block = rows[0] ?? null;
+      if (block) {
+        block.tx = JSON.parse(block.tx);
+        if (block.tx.length === 0) {
+          block = null;
+        }
+      }
+    }
+    // Fetch it from core
     if (!block) {
       const blockHash = await bitcoinClient.getBlockHash(parseInt(blockHeight, 10));
       block = await bitcoinClient.getBlock(blockHash, 2);
-      this.blocksCache[block.height] = block;
     }
+    this.blocksCache[block.height] = block;
 
-    const blocksCacheHashes = Object.keys(this.blocksCache).sort();
+    const blocksCacheHashes = Object.keys(this.blocksCache).sort((a, b) => parseInt(b) - parseInt(a)).reverse();
     if (blocksCacheHashes.length > BLOCKS_CACHE_MAX_SIZE) {
       for (let i = 0; i < 10; ++i) {
         delete this.blocksCache[blocksCacheHashes[i]];
@@ -92,7 +112,7 @@ class FundingTxFetcher {
     this.fundingTxCache[channelId] = {
       timestamp: block.time,
       txid: block.tx[txIdx].txid,
-      value: block.tx[txIdx].vout[outputIdx].value,
+      value: block.tx[txIdx].value / 100000000 ?? block.tx[txIdx].vout[outputIdx].value,
     };
 
     ++this.channelNewlyProcessed;

backend/src/tasks/lightning/sync-tasks/stats-importer.ts

@@ -1,10 +1,12 @@
 import DB from '../../../database';
-import { readdirSync, readFileSync } from 'fs';
+import { promises } from 'fs';
 import { XMLParser } from 'fast-xml-parser';
 import logger from '../../../logger';
 import fundingTxFetcher from './funding-tx-fetcher';
 import config from '../../../config';
 
+const fsPromises = promises;
+
 interface Node {
   id: string;
   timestamp: number;
@@ -33,14 +35,12 @@ class LightningStatsImporter {
   topologiesFolder = config.LIGHTNING.TOPOLOGY_FOLDER;
   parser = new XMLParser();
 
-  latestNodeCount = 1; // Ignore gap in the data
-
   async $run(): Promise<void> {
     logger.info(`Importing historical lightning stats`);
 
-    // const [channels]: any[] = await DB.query('SELECT short_id from channels;');
+    const [channels]: any[] = await DB.query('SELECT short_id from channels;');
-    // logger.info('Caching funding txs for currently existing channels');
+    logger.info('Caching funding txs for currently existing channels');
-    // await fundingTxFetcher.$fetchChannelsFundingTxs(channels.map(channel => channel.short_id));
+    await fundingTxFetcher.$fetchChannelsFundingTxs(channels.map(channel => channel.short_id));
     
     await this.$importHistoricalLightningStats();
   }
@@ -148,6 +148,8 @@ class LightningStatsImporter {
     const capacities: number[] = [];
     const feeRates: number[] = [];
     const baseFees: number[] = [];
+    const alreadyCountedChannels = {};
+    
     for (const channel of networkGraph.channels) {
       const tx = await fundingTxFetcher.$fetchChannelOpenTx(channel.scid.slice(0, -2));
       if (!tx) {
@@ -173,10 +175,14 @@ class LightningStatsImporter {
       nodeStats[channel.destination].capacity += Math.round(tx.value * 100000000);
       nodeStats[channel.destination].channels++;
 
-      capacity += Math.round(tx.value * 100000000);
+      if (!alreadyCountedChannels[channel.scid.slice(0, -2)]) {
+        capacity += Math.round(tx.value * 100000000);
+        capacities.push(Math.round(tx.value * 100000000));
+        alreadyCountedChannels[channel.scid.slice(0, -2)] = true;
+      }
+
       avgFeeRate += channel.fee_proportional_millionths;
       avgBaseFee += channel.fee_base_msat;
-      capacities.push(Math.round(tx.value * 100000000));
       feeRates.push(channel.fee_proportional_millionths);
       baseFees.push(channel.fee_base_msat);
     }
@@ -186,6 +192,7 @@ class LightningStatsImporter {
     const medCapacity = capacities.sort((a, b) => b - a)[Math.round(capacities.length / 2 - 1)];
     const medFeeRate = feeRates.sort((a, b) => b - a)[Math.round(feeRates.length / 2 - 1)];
     const medBaseFee = baseFees.sort((a, b) => b - a)[Math.round(baseFees.length / 2 - 1)];
+    const avgCapacity = Math.round(capacity / capacities.length);
     
     let query = `INSERT INTO lightning_stats(
       added,
@@ -207,14 +214,14 @@ class LightningStatsImporter {
 
     await DB.query(query, [
       timestamp,
-      networkGraph.channels.length,
+      capacities.length,
       networkGraph.nodes.length,
       capacity,
       torNodes,
       clearnetNodes,
       unannouncedNodes,
       clearnetTorNodes,
-      Math.round(capacity / networkGraph.channels.length),
+      avgCapacity,
       avgFeeRate,
       avgBaseFee,
       medCapacity,
@@ -241,10 +248,10 @@ class LightningStatsImporter {
   }
 
   async $importHistoricalLightningStats(): Promise<void> {
-    const fileList = readdirSync(this.topologiesFolder);
+    const fileList = await fsPromises.readdir(this.topologiesFolder);
     fileList.sort().reverse();
 
-    const [rows]: any[] = await DB.query('SELECT UNIX_TIMESTAMP(added) as added FROM lightning_stats');
+    const [rows]: any[] = await DB.query('SELECT UNIX_TIMESTAMP(added) AS added FROM lightning_stats');
     const existingStatsTimestamps = {};
     for (const row of rows) {
       existingStatsTimestamps[row.added] = true;
@@ -252,26 +259,30 @@ class LightningStatsImporter {
 
     for (const filename of fileList) {
       const timestamp = parseInt(filename.split('_')[1], 10);
-      const fileContent = readFileSync(`${this.topologiesFolder}/${filename}`, 'utf8');
-
-      const graph = this.parseFile(fileContent);
-      if (!graph) {
-        continue;
-      }
-
-      // Ignore drop of more than 90% of the node count as it's probably a missing data point
-      const diffRatio = graph.nodes.length / this.latestNodeCount;
-      if (diffRatio < 0.90) {
-        continue;
-      }
-      this.latestNodeCount = graph.nodes.length;
 
       // Stats exist already, don't calculate/insert them
-      if (existingStatsTimestamps[timestamp] === true) {
+      if (existingStatsTimestamps[timestamp] !== undefined) {
         continue;
       }
 
       logger.debug(`Processing ${this.topologiesFolder}/${filename}`);
+      const fileContent = await fsPromises.readFile(`${this.topologiesFolder}/${filename}`, 'utf8');
+
+      let graph;
+      if (filename.indexOf('.json') !== -1) {
+        try {
+          graph = JSON.parse(fileContent);
+        } catch (e) {
+          logger.debug(`Invalid topology file, cannot parse the content`);
+        }
+      } else {
+        graph = this.parseFile(fileContent);
+        if (!graph) {
+          logger.debug(`Invalid topology file, cannot parse the content`);
+          continue;
+        }
+        await fsPromises.writeFile(`${this.topologiesFolder}/${filename}.json`, JSON.stringify(graph));
+      }
 
       const datestr = `${new Date(timestamp * 1000).toUTCString()} (${timestamp})`;
       logger.debug(`${datestr}: Found ${graph.nodes.length} nodes and ${graph.channels.length} channels`);
@@ -282,6 +293,8 @@ class LightningStatsImporter {
 
       logger.debug(`Generating LN network stats for ${datestr}`);
       await this.computeNetworkStats(timestamp, graph);
+
+      existingStatsTimestamps[timestamp] = true;
     }
 
     logger.info(`Lightning network stats historical import completed`);